Custom workflows - API

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• Close this issue

API to do the following:

• Configure the stages per group: https://gitlab.com/gitlab-org/gitlab-ee/issues/2059.
• Change stage per issue: https://gitlab.com/gitlab-org/gitlab-ee/issues/8181
  • And the issue should have system notes generated on them automatically: https://gitlab.com/gitlab-org/gitlab-ee/issues/8182.